Remember to check your window well for water ac.ulation. The purpose of the gravel is to improve drainage, but poor window well installation or a bad grade can actually produce the opposite effect..Precast Concrete Products. Welcome To Genest Precast! Located on Route in Sanford, Maine, Genest Precast is a family owned and operated business that has been providing high quality precast products for over years..At Drainage Erosion Solutions LLC. we offer aestheti.y pleasing and professionally engineered solutions to drainage and erosion problems. today!.Window Well Installation. Installing window wells is a very good way of preventing unwanted water from entering into your ba.t windows.Window wells also allow the finish grade to be brought to an elevation higher than the window while still letting light into the window How To Install Window Wells. Window well installation is fairly easy for new construction and not all that more .